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Digital Output is 1001b
Appendix C. Address Mapping
IO Address Map
I/O address Range Description
000-01F
DMA Controller #1
020-021
Interrupt Controller #1, Master
040-05F 8254
timer
060-06F
8042 (Keyboard Controller)
070-07F
Real time Clock, NMI Mask
080-09F
DMA Page Register
0A0-0BF
Interrupt Controller #2
0C0-0DF
DMA Controller #2
0F0
Clear Math Coprocessor Busy
0F1
Reset Math Coprocessor
0F2
Core logic programming configuration
0F8-0FF Math
Coprocessor
1F0-1F8 Fixed
Disk
2F8-2FF
Serial Port 2
300-31F Prototype
Card
360-36F Reserved
378-37F
Parallel Printer Port 1 (LPT2)
3B0-3BF
Monochrome Display and Printer Adapter
(LPT1)
3C0-3CF Reserved
3D0-3DF
Color/Graphics Monitor Adapter
3F0-3F7 Diskette
Controller
3F8-3FF
Serial Port 1